Funding for this research was provided by:
Text and Data Mining valid from 2018-07-16
Received: 2 February 2018
Accepted: 3 July 2018
First Online: 16 July 2018
Ethics approval and consent to participate
: Our study is based on claims data, i.e., on routinely collected data. The use of this sort of data for scientific purposes is regulated by federal law, and the data protection officer of the Statutory Local Health Insurance of Lower Saxony (AOK Niedersachsen) has approved its use.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.